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Old 12-20-2004, 06:08 PM   #1
robfuqua
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Join Date: Jun 2003
Location: Pensacola, Florida (L.A.)
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2005 STI
A lil' better than stock

Impreza WRX STi What tire pressures are you using on '05 STI?

The book says 36 front and 30 rear, but it also goes into saying that the AWD system (and computers) are very sensitive to tire pressure. THE PROBLEM I'M HAVING IS "BUMP STEER"; CAR GETS ALL SQUIRRELY ON GROOVED OR CROWNED PAVEMENT; TWITCHED LEFT AND RIGHT.
Any help would be appreciated....

Rob (2005 STI, Stock Bridgestones--36psi front, 30 rear IAW Owner's Manual)
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Old 12-20-2004, 07:05 PM   #2
awilson529
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My STi gets "squirrely" on rutty and grooved pavement also. I think its just something we have to live with. BTW, my allignment is to-spec, I have Falken Azenis tires and a Perrin rear bar.

Adam
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Old 12-20-2004, 08:42 PM   #3
robfuqua
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A lil' better than stock

Impreza WRX STi

Thanx, I think I might try fooling-around with the tire psi a little, I'm probably going to drop the car soon onto a set of STI Pinks... I think that'll be my first mod....and maybe it'll help the handling.

Rob
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Old 12-20-2004, 08:44 PM   #4
majmun
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I use the stock settings for every day driving. If I'm going to head up the mountain for some fun, I may increase the pressure a couple of psi. There's been quite a bit of discussion on tire pressures, so do a search to find out all that you'd want to know.
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Old 12-20-2004, 09:06 PM   #5
finnRex
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The STi tire is a relatively low profile tire. I've been keeping mine around almost 40 psi. That's a bit high, but it also doesn't cause tire wear. BTW, I don't live where it snows, so that isn't a factor for me.



Mika
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Old 12-21-2004, 08:53 AM   #6
Cabal
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You have good summer times with low-profile, stiff sidewalls that track with the road. This is normal.
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Old 12-21-2004, 01:33 PM   #7
powerslide23
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Quote:
Originally Posted by robfuqua
The book says 36 front and 30 rear, but it also goes into saying that the AWD system (and computers) are very sensitive to tire pressure. THE PROBLEM I'M HAVING IS "BUMP STEER"; CAR GETS ALL SQUIRRELY ON GROOVED OR CROWNED PAVEMENT; TWITCHED LEFT AND RIGHT.
Any help would be appreciated....

Rob (2005 STI, Stock Bridgestones--36psi front, 30 rear IAW Owner's Manual)
You have a very stiff sidewall ultra performance summer tire (actually a street race tire). You will feel everything on the road so nothing to worry.

For winter, I have switched to P Zero Nero's (245/40/17) and it is a little forgiving but I can still feel the transition, bumps, etc. The twitching will not be fixed by pink springs.
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